Shenyang, capital of the Liaoning Province in northeast China, reached a best-ever air quality record, with 323 days of clean air in 2007. According to the Xinhua News Agency, the regional environmental protection department published figures showing that Shenyang citizens enjoyed clean air most days of last year.
The result is ascribed to a series of measures taken by the local government to curb air pollution, including tree planting and chimney removing projects. Many industrial enterprises in the region were ordered to cut pollutant discharges as well.
Shenyang recently launched the Olympic Environment Safety Project which focuses on vehicle emissions control. From June 1st on, all renewed buses should meet the national III emitting standard. Meanwhile, all the running buses should use fuel cleaning additives and avoid black smoking.
Source (in Chinese): http://www.vecc-sepa.org.cn/news/news_detail.jsp?newsid=23677